www.mooseframework.org
SinDirichletBC.C
Go to the documentation of this file.
1 //* This file is part of the MOOSE framework
2 //* https://www.mooseframework.org
3 //*
4 //* All rights reserved, see COPYRIGHT for full restrictions
5 //* https://github.com/idaholab/moose/blob/master/COPYRIGHT
6 //*
7 //* Licensed under LGPL 2.1, please see LICENSE for details
8 //* https://www.gnu.org/licenses/lgpl-2.1.html
9 
10 #include "SinDirichletBC.h"
11 
13 
14 template <>
17 {
19  params.set<Real>("initial") = 0.0;
20  params.set<Real>("final") = 0.0;
21  params.set<Real>("duration") = 0.0;
22  params.addClassDescription(
23  "Imposes a time-varying essential boundary condition $u=g(t)$, where $g(t)$ "
24  "varies from an given initial value at time $t=0$ to a given final value over a specified "
25  "duration.");
26  return params;
27 }
28 
30  : NodalBC(parameters),
31  _initial(getParam<Real>("initial")),
32  _final(getParam<Real>("final")),
33  _duration(getParam<Real>("duration"))
34 {
35 }
36 
37 Real
39 {
40  Real value;
41 
42  if (_t < _duration)
43  value = _initial + (_final - _initial) * std::sin((0.5 / _duration) * libMesh::pi * _t);
44  else
45  value = _final;
46 
47  return _u[_qp] - value;
48 }
InputParameters validParams< NodalBC >()
Definition: NodalBC.C:19
A spatially-constant, time-varying NodalBC whose imposed value g(t) varies sinusoidally with time acc...
virtual Real computeQpResidual() override
T & set(const std::string &name, bool quiet_mode=false)
Returns a writable reference to the named parameters.
registerMooseObject("MooseApp", SinDirichletBC)
The main MOOSE class responsible for handling user-defined parameters in almost every MOOSE system...
InputParameters validParams< SinDirichletBC >()
Base class for deriving any boundary condition that works at nodes.
Definition: NodalBC.h:26
SinDirichletBC(const InputParameters &parameters)
virtual const OutputTools< Real >::VariableValue & value()
The value of the variable this object is operating on.
void addClassDescription(const std::string &doc_string)
This method adds a description of the class that will be displayed in the input file syntax dump...
const VariableValue & _u
Value of the unknown variable this BC is acting on.
Definition: NodalBC.h:49
unsigned int _qp
Quadrature point index.
Definition: NodalBC.h:47